I have noticed something a bit strange doing a big band chart using J&BB. Using average seeting of velocity and modulstion for the horns & brass, the drums were much quiter than them, using average velocity settings for the drums. Why am I complaining, I hear you sax players ask. Maybe this is Gary's revenge for all those loud drummers we've all endured. Any clues as to what I am missing, you wise people.
The main point really is that there's no reason to stick to the default volumes for any of the instruments, not just the drums in JABB. It's all raw material for us to work with, including how we'd like the instruments to balance out in a mix.